Korn shell scripts freeze on a computer that is running Windows Vista or Windows Server 2008

Symptoms

Assume that you install Subsystem for UNIX-based Applications (SUA) on a computer that is running Windows Vista or Windows Server 2008. Additionally, assume that you run a Korn shell script that creates child processes on this computer. In this situation, the main process of the Korn shell script freezes.

Cause

This issue occurs because the SIGCHLD signal is not delivered to the thread in the Korn shell.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows Vista Service Pack 2 (SP2) or Windows Server 2008 SP2.

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.
File information

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008
File nameX86_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.0.6002.22991_none_f66d4e66b6f7c9e2.manifest
File versionNot applicable
File size67,914
Date (UTC)01-Dec-2012
Time (UTC)03:33
PlatformNot applicable
File nameX86_subsystem-for-unix-based-applications_31bf3856ad364e35_6.0.6002.22991_none_75f82c59067b8644.manifest
File versionNot applicable
File size72,810
Date (UTC)01-Dec-2012
Time (UTC)03:33
PlatformNot applicable
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
File nameAmd64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.0.6002.22991_none_528be9ea6f553b18.manifest
File versionNot applicable
File size67,414
Date (UTC)01-Dec-2012
Time (UTC)03:55
PlatformNot applicable
File nameAmd64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.0.6002.22991_none_d216c7dcbed8f77a.manifest
File versionNot applicable
File size73,989
Date (UTC)01-Dec-2012
Time (UTC)03:55
PlatformNot applicable
File nameWow64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.0.6002.22991_none_5ce0943ca3b5fd13.manifest
File versionNot applicable
File size42,587
Date (UTC)01-Dec-2012
Time (UTC)03:26
PlatformNot applicable
File nameWow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.0.6002.22991_none_dc6b722ef339b975.manifest
File versionNot applicable
File size42,068
Date (UTC)01-Dec-2012
Time (UTC)03:27
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008
File nameIa64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.0.6002.22991_none_75f9d04f06798f40.manifest
File versionNot applicable
File size73,967
Date (UTC)01-Dec-2012
Time (UTC)02:24
PlatformNot applicable
File nameWow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.0.6002.22991_none_dc6b722ef339b975.manifest
File versionNot applicable
File size42,068
Date (UTC)01-Dec-2012
Time (UTC)03:27
PlatformNot applicable
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